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Area Forecast Discussion (AFD)

Issued by Eureka, CA (EKA)

                            
819 
FXUS66 KEKA 201125
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
425 AM PDT Fri Apr 20 2018

.SYNOPSIS...Mainly dry weather will occur across the region 
during the next seven days. This will bring above normal
temperatures in the inland areas. Along the coast periods of 
breezy north winds and occasional marine stratus will keep
temperatures near normal.

&&

.DISCUSSION...High pressure is currently centered over the area.
This will start to shift off to the east today with an 
approaching shortwave. The stratus should increase along the 
coast late this afternoon or evening as the wind flow becomes more
onshore. Inland temperatures will continue to warm up today, 
highs should climb into the 70s. Tonight a weak trough moves 
through the area which is only expected to bring a few high 
clouds. The warm afternoon temperatures, slightly increased winds 
and the potential for a few clouds should limit the chance for 
frost to only the coldest spots in Trinity county tonight. 

Saturday dry air and breezy conditions should mix out any low
clouds along the coast. This should also help inland temperatures
to warm into the upper 70s to low 80s. Saturday night another
shortwave moves through the area. This will cool temperatures
slightly for Sunday afternoon in the inland areas. Northerly winds
will also increase as this feature moves past the area. Frost is 
possible both nights, but coverage should be limited to the
most protected valleys mainly in Trinity county. 

High pressure is expected to remain in place over the area on
Monday and Tuesday. Highs will be in the upper 70s to low 80s in
the inland areas. The coast may see highs in the 60s on Monday and
should see mainly clear skies. Tuesday the ridge axis looks to
move east of the area increasing the potential for stratus along
the coast and that will keep coastal temperatures cooler. 
Northerly winds along the coast should start to diminish as well. 

Wednesday an upper level low starts to approach the area. The
models start to disagree on the exact timing and location of the
system, but there is general agreement that the low will remain 
in the area through the week. This brings the potential for some 
showers over the inland areas, but confidence is low on the timing
and location of these. The pressure gradient will also relax which
could allow some coastal clouds to form. Inland temperatures will
cool and likely return closer to normal. Widespread rain doesn't 
look likely at this point. MKK

&&

.AVIATION...An area of low clouds formed this evening over the Eel 
River Delta and up the adjacent valley. These clouds have not 
expanded and have actually pulled a little bit farther up the valley 
away from the coast. Adjusted the ACV TAF earlier to scale back on 
MVFR ceilings, with only a brief tempo group around sunrise. Even 
this is highly uncertain at this time. Other than some mid and high 
cloudiness later today and some gusty winds along the Redwood Coast 
during the afternoon, generally benign conditions are expected to 
continue. /SEC

&&

.MARINE...NW to N winds will decrease a bit today across the N 
outer waters, but remain near advisory strength over the S outer 
waters. Winds will increase across the area by Saturday afternoon 
with gales expected over the outer waters as a thermal trough 
strengthens over the mainland. Have hoisted a Gale Watch for the 
outer waters from 3 PM Saturday thru Sunday night. NW swells will 
continue through the period. /SEC

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Frost Advisory until 9 AM PDT Friday for CAZ105-107-108.

NORTHWEST CALIFORNIA COASTAL WATERS...
    Gale Watch from Saturday afternoon through Sunday evening 
    for PZZ470-475.

     Small Craft Advisory until 6 AM PDT early this morning for 
     PZZ470.

     Small Craft Advisory until 3 PM PDT Saturday for PZZ475.
&&

$$

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